Makefile

CC := aarch64-linux-gnu-gcc
LD := aarch64-linux-gnu-ld
OBJCOPY := aarch64-linux-gnu-objcopy
CCFLAGS := -MMD -g -Iinclude -fno-stack-protector -ffreestanding -nostdinc -nostdlib -DKERNEL

TARGET_NAME := kernel8
TARGET := $(TARGET_NAME).img
SRC := $(wildcard src/*.c)
ASRC := $(wildcard src/*.S)
OBJ = $(patsubst %.c, build/%.o, $(notdir $(SRC)))
OBJ += $(patsubst %.S, build/%.o, $(notdir $(ASRC)))

all: build $(TARGET)

$(TARGET): $(OBJ)
	@# link object files to elf file
	$(LD) -T linker.ld -o $(TARGET_NAME).elf $^
	@# conver elf file to a raw binary image
	$(OBJCOPY) -O binary $(TARGET_NAME).elf $(TARGET)

build/%.o: src/%.c
	$(CC) $(CCFLAGS) -c $< -o $@

build/%.o: src/%.s
	$(CC) $(CCFLAGS) -c $< -o $@

build:
	mkdir -p build

clean:
	rm -f $(TARGET)
	rm -f *.elf
	rm -rf build

-include $(OBJ:.o=.d)